In Swabia, the shared areas of an apartment building are cleaned in turn. This is the Kehrwoche, the sweeping week. Some buildings still have a sign with the word Kehrwoche in bold print. It hangs on the door of the tenant whose turn it is. The custom was once also backed by decrees. In 1492, Duke Eberhard ordered for Stuttgart: Damit die Stadt rein erhalten wird, soll jeder seinen Mist alle Wochen hinausführen. So that the town is kept clean, everyone shall carry out his dung every week. Stuttgart abolished the duty to sweep every week on December 17, 1988. Since then, sidewalks only have to be cleaned when they are dirty.